[JS] add CLI test for KT-60531

compiler/testData/cli/js/compilationErrorK2.args

@@ -0,0 +1,9 @@
+$TESTDATA_DIR$/compilationErrorK2.kt
+-language-version
+2.0
+-ir-output-dir
+$TEMP_DIR$
+-ir-output-name
+compilationErrorK2.kt
+-libraries
+libraries/stdlib/build/classes/kotlin/js/main

compiler/testData/cli/js/compilationErrorK2.kt

@@ -0,0 +1,11 @@
+class Foo {
+    private companion object Test {
+
+    }
+}
+
+class Bar {
+    fun a() {
+        Foo.Test
+    }
+}

compiler/testData/cli/js/compilationErrorK2.out

@@ -0,0 +1,5 @@
+warning: language version 2.0 is experimental, there are no backwards compatibility guarantees for new language and library features
+compiler/testData/cli/js/compilationErrorK2.kt:9:13: error: cannot access 'companion object Test : Any': it is private in '/Foo'.
+        Foo.Test
+            ^
+COMPILATION_ERROR

compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java

@@ -1333,6 +1333,11 @@ public class CliTestGenerated extends AbstractCliTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/cli/js"), Pattern.compile("^(.+)\\.args$"), null, false);
         }
 
+        @TestMetadata("compilationErrorK2.args")
+        public void testCompilationErrorK2() throws Exception {
+            runTest("compiler/testData/cli/js/compilationErrorK2.args");
+        }
+
         @TestMetadata("createMetadata.args")
         public void testCreateMetadata() throws Exception {
             runTest("compiler/testData/cli/js/createMetadata.args");